. The Biological bulletin. Biology; Zoology; Marine biology. PHYSIOLOGICAL GRADIENT IN MNEMIOPSIS 201 regenerate. In making this test specimens were cut across at four levels and the regenerating oral pieces were observed. The progressive changes following these cuttings at these levels were very similar. This resemblance is illustrated in Figs. 3 to 10 where the arrows which point to a plate in a similar location on each of a series show that it is pos- sible to believe that in Figs. 3 to 6 are represented four different stages of one animal. These figures represent four different animals at
. The Biological bulletin. Biology; Zoology; Marine biology. PHYSIOLOGICAL GRADIENT IN MNEMIOPSIS 201 regenerate. In making this test specimens were cut across at four levels and the regenerating oral pieces were observed. The progressive changes following these cuttings at these levels were very similar. This resemblance is illustrated in Figs. 3 to 10 where the arrows which point to a plate in a similar location on each of a series show that it is pos- sible to believe that in Figs. 3 to 6 are represented four different stages of one animal. These figures represent four different animals at four different stages during regeneration. In Figs. 7 to 10 four other speci- mens which were cut at a lower level than those in Figs. 3 to 6 are. Fig. 2. These are photographs of the adtentacular surfaces of two specimens to which apical organs were grafted at level 3 (Table III). A shows the graft connected to two adtentacular canals of the host. B shows the graft connected to the tentacular canal (at arrow) of the host. Both photographs were taken five days after the operations. shown. The results of these experiments (Table I) show clearly that there is no difference in the time of regeneration at the four levels of the body. Following the removal of sections from plate rows the remaining ends of the rows pulled together, fused, stretched, and formed solid cords which later became hollow as described by Coonfield (1937a). Later new plates formed in the healed region and in between the old plates which had been pulled apart by the stretching. The results of these experiments are shown in Table II. Here the average time in. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Lillie, Frank Rattray, 1870-1947; Moore, Carl Richard, 1892-; Redfield, Alfred Clarence, 1890-; Marine Biological Laboratory (Woods Hole,
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